eldavojohn writes: Standford's OpenSim software is a human motion modeling package that is currently making the rounds at museums where 'visitors walk across a pressure-sensitive floor and are presented at the other side with color-coded print outs of their weight distribution, identifying even slight imbalances that might be putting undue stress on their limbs and joints.' This project can also help with planning surgery. The work of Scott L. Delp, Frank C. Anderson, Allison S. Arnold, Peter Loan, Ayman Habib, Chand T. John, Eran Guendelman, and Darryl G. Thelen has been published in IEEE Transactions on Biomedical Engineering (note that this is a different effort from the virtual world of the same name). Although Standford's press release says it is now open source, I cannot find what license they are using nor can I access their SVN browser after registering.